In the police community, infighting between different police stations has never been rare, and it is well known that Mapu and Xidamen have been fighting each other all the time. Huang Zacheng (Park Joong-hoon) is the sheriff of Mapu Bureau and a thorough activist. Although he has not received systematic training and education, Huang Zaicheng has been climbing in the workplace by virtue of his daring and daring to kill, and has won the recognition of his colleagues and superiors with his real record, but his too rude way of handling cases has also offended many of his peers. Zheng Yican (Li Shanjun is acted the role of) is a rookie detective, newly arrived, Zheng Yican on the future career path is full of drive and ambition, hope to be able to do a great job in the field. The occurrence of a rape case also attracted the attention of Huang Zaicheng and Zheng Yican, both of whom hope to solve the case and become a veritable "king of arrest".